Table 3.

Table showing the average ± standard deviation in each ROI among the three groups according to the location of highest stress.

	Principal tensile stress (MPa)*	Maximum shear stress (MPa)	Location
No radiation (Control)	2.40 ± 0.82	46.04 ± 10.63	Outer enamel–buccal occlusal
In vivo radiation	2.56 ± 1.27	45.32 ± 10.34
In vitro radiation	2.35 ± 0.83	44.92 ± 10.81
No radiation (Control)	10.75 ± 2.14	58.57 ± 1.60	Middle enamel
In vivo radiation	12.49 ± 2.45	59.33 ± 1.62
In vitro radiation	10.09 ± 1.91	58.27 ± 1.83
No Radiation (Control)	8.44 ± 1.57	57.83 ± 2.07	Inner enamel cervical
In vivo radiation	9.97 ± 1.32	58.18 ± 1.53
In vitro radiation	8.15 ± 0.97	57.81 ± 1.82
No radiation (Control)	7.98 ± 1.46	50.39 ± 1.59	Dentin-enamel junction
In vivo radiation	8.29 ± 1.19	49.24 ± 2.11
In vitro radiation	9.72 ± 2.01	52.66 ± 2.54

^*Observed increases bolded as compared to the no radiation (control) group.; The location of the region of interest where the highest stresses were observed is shown in the last column for each group.